#ERROR#使用了未初始化的本地指针变量'ptrNames'

Question

如果我运行此代码,我得到错误"可能未初始化的本地指针变量'ptrNames'使用":

void processHits (GLint hits, GLuint buffer[]) //Some prints
{
    unsigned int i, j;
    GLuint names, *ptr, minZ,*ptrNames, numberOfNames;
    if (hits == 0)
        noSelected = true;
    else 
        noSelected = false;
    ptr = (GLuint *) buffer;
    minZ = 0xffffffff;
    for (i = 0; i < hits; i++) {
        names = *ptr;
        ptr++;
        if (*ptr < minZ) {
            numberOfNames = names;                                                   
            minZ = *ptr;
            ptrNames = ptr+2;
        }
        ptr += names+2;
    }
    ptr = ptrNames; //Error at this line!
    for (j = 0; j < numberOfNames; j++,ptr++) {
        if (hits > 0)
           LastSelected = *ptr;
    }
}

Answer 1

错误是正确的. ptrNames仅在测试if (*ptr < minZ)成功时初始化.

最简单的修正可能会初始化ptrNames到NULL第一后,再检查它的价值for循环,恢复(因为没有命中处理),如果它没有被更新.

void processHits (GLint hits, GLuint buffer[]) //Some prints
{
    unsigned int i, j;
    GLuint names, *ptr, minZ,*ptrNames=NULL, numberOfNames;
    ...
    if (ptrNames == NULL)
        return;
    ptr = ptrNames;
    ...
}